Dental material

Abstract

A white, substantially non-iron containing dental material formed from Portland cement. The material may be a dental cement, dental restorative or the like.

1. A dental material comprising Portland cement and which contains:
 from about 50 to about 75 weight percent calcia; 
 from about 15 to about 29 weight percent silica; 
 alumina; 
 less than about 0.5 percent by weight of iron oxide; and 
 a radiopacifier 
 
       based upon 100 percent by weight of the material. 
     
     
       2. The dental material as in  claim 1  which is white in color. 
     
     
       3. The dental material as in  claim 1 , wherein the radiopacifier is present in an amount of less than 40 weight percent of the material. 
     
     
       4. The dental material as in  claim 3 , wherein the radiopacifier is bismuth oxide, fluoride releasing glass, or barium sulfate. 
     
     
       5. The dental material as in  claim 1 , wherein the radiopacifier is bismuth oxide, fluoride releasing glass, or barium sulfate. 
     
     
       6. The dental material as in  claim 3 , wherein the radiopacifier is bismuth oxide. 
     
     
       7. The dental material as in  claim 1 , wherein the radiopacifier is bismuth oxide. 
     
     
       8. The dental material as in  claim 1 , wherein the material has a radiopacity equal to 3 mm of aluminum at a cement thickness of 1 mm. 
     
     
       9. The dental material as in  claim 3 , wherein the material is free of particles coarser than 400 mesh (44 μm). 
     
     
       10. The dental material as in  claim 1 , wherein alumina is present from 2 to about 15 weight percent of the material. 
     
     
       11. The dental material as in  claim 1 , wherein alumina is present from about 5 to about 15 weight percent of the material. 
     
     
       12. The dental material as in  claim 1 , wherein:
 a) the radiopacifier is present in an amount of less than 40 weight percent of the material; 
 b) the radiopacifier is bismuth oxide, fluoride releasing glass, or barium sulfate; and 
 c) the material is free of particles coarser than 400 mesh (44 μm). 
 
     
     
       13. The dental material as in  claim 12 , wherein the material has a radiopacity equal to 3 mm of aluminum at a cement thickness of 1 mm. 
     
     
       14. The dental material as in  claim 13 , wherein the radiopacifier is bismuth oxide. 
     
     
       15. The dental material as in  claim 14 , wherein silica is present from about 15 to about 25 weight percent of the material. 
     
     
       16. The dental material as in  claim 15 , wherein alumina, is present from 2 to about 15 weight percent of the material. 
     
     
       17. The dental material as in  claim 16 , wherein calcia is present from about 61 to about 70 weight percent of the material.